Java RuleBasedCollator compare()用法及代碼示例

java.text.RuleBasedCollator類的compare()方法用於比較兩個對象的強度，並且根據結果將返回0，正值和負值作為輸出。

用法:

public int compare(Object o1, Object o2)

參數：此方法需要兩個對象之間進行比較。

返回值：如果第一個對象等於，小於或小於另一個對象，則它將分別返回零，正值和負值。

異常：如果參數之一為null，則此方法引發NullPointerException。

下麵是說明compare()方法的示例：

範例1：

// Java program to demonstrate 
// compare() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        try { 
  
            // Creating and initializing 
            // RuleBasedCollator Object 
            RuleBasedCollator col 
                = new RuleBasedCollator("< a< b< c< d"); 
  
            // Creating an initializing 
            // object for comparison 
            Object obj1 = "ab"; 
  
            // Creating an initializing 
            // Object for comparison 
            Object obj2 = "Ab"; 
  
            // compare both object 
            // using compare() mehtod 
            int i 
                = col.compare((String)obj1, 
                              (String)obj2); 
  
            // display result 
            if (i < 0) 
                System.out.println("ab is less than Ab"); 
            else if (i > 0) 
                System.out.println("ab is greater than Ab"); 
            else
                System.out.println("ab is equal to Ab"); 
        } 
  
        catch (ParseException e) { 
  
            System.out.println(e); 
        } 
        catch (NullPointerException e) { 
  
            System.out.println(e); 
        } 
    } 
}

輸出：

ab is less than Ab

範例2：

// Java program to demonstrate 
// compare() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        try { 
  
            // Creating and initializing RuleBasedCollator Object 
            RuleBasedCollator col 
                = new RuleBasedCollator("< a< b< c< d"); 
  
            // Creating an initializing 
            // object for comparison 
            Object obj1 = null; 
  
            // Creating an initializing 
            // Object for comparison 
            Object obj2 = "Ab"; 
  
            // compare both object 
            // using compare() mehtod 
            int i 
                = col.compare((String)obj1, (String)obj2); 
  
            // display result 
            if (i < 0) 
                System.out.println("ab is less than Ab"); 
            else if (i > 0) 
                System.out.println("ab is greater than Ab"); 
            else
                System.out.println("ab is equal to Ab"); 
        } 
  
        catch (ParseException e) { 
  
            System.out.println(e); 
        } 
        catch (NullPointerException e) { 
            System.out.println("one of the object is null"); 
            System.out.println(e); 
        } 
    } 
}

輸出：

one of the object is null
java.lang.NullPointerException

參考： https://docs.oracle.com/javase/9/docs/api/java/text/RuleBasedCollator.html#compare-java.lang.String-java.lang.String-

相關用法

注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 RuleBasedCollator compare() method in Java with Example。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。